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Aniakchak - Surprise Lake to Aniakchak Bay

Aniakchak, Alaska, US

Surprise Lake to Aniakchak Bay

Usual Difficulty

I-IV (for normal flows)

Length

32 Miles

Avg. Gradient

30 fpm

Max Gradient

83 fpm

Aniakchak

AniakchakPhoto by Troy Hamon

River Description

The Aniakchak River, a Federally-designated Wild and Scenic River, is located within the Aniakchak National Mounment and Preserve providing an opportunity
for a remote river expedition on the Alaska Peninusla. Trips usually take place during the month
of July. Plan for 3-4 days but be prepared for longer as weather conditions often dictate the
schedule.

The Aniakchak Volcano underwent a catostrophic explosive erruption approximately 3400 years ago
that formed the current caldera. Smaller erruptions have occurred more recently, with the last
one in 1931. Surprise Lake, located within the 5.9 mile diameter caldera, is the source of the
Aniakchak River. This caldera has its own microclimate marked by consistently wet weather and
harsh winds. Despite this it offers opportunities for exploration and hiking across the volcanic
landscape.

From the lake the river begins at a slow pace for the first mile before entering the "Gates", a
1500 foot gash in the caldera wall. Here the river drops at a rate of 73 feet per mile with class
IV whitewater. The river remains class II/III for the next 10 miles (if you're in an inflatible
be sure to pack the patch kit as the sharp volcanic rocks can do a number on your boat). At the
confluence of Hidden Creek the river enters the steep 83 feet per mile section where volcanic
bedrock on either side and boulders in the channel constrict the flow. The pace of the river
begins to slow considerably over the next five miles as you leave this section and continue the
remainder of the journey on a low-gradient alluvial river that takes you to the ocean.

The river system supports all five species of salmon and Surprise Lake provides spawning habitat
and a nursery for sockeye salmon and artic char. Dolly Varden are also present. Wildlife are
abundant and brown bear are common along this river so be sure to take proper precautions and be
prepared for encounters.

LOGISTICS: The expense of getting to this river and the unpredictable weather keep usage low. You
can get commerical service into King Salmon or to Port Heiden. From either of these airstrips
you'll need to arrange for a float plane charter to Surprise Lake. King Salmon is further away
(150 miles vs. 20 miles) but offers more options. You will also need to arrange for pick up at
the end of your trip where the river meets the ocean at Aniakchak Bay. Float planes can land in
the bay or wheel planes can land on the beachhead. Poor weather conditions can delay flights so
plan accordingly. There is a shelter at the beach for boaters awaiting pick up. This region is
extremely remote with no practical access to outside assistance.

StreamTeam Status: Not Verified

Last Updated: 2004-09-03 14:12:15

Rapid Descriptions

No rapids entered. If you know names, and locations of the rapids please contact and advise the StreamTeam member for this run.